The WM_NCMBUTTONUP message is posted when the user releases the middle mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCMBUTTONUP nHittest = (INT) wParam; // hit-test value pts = MAKEPOINTS(lParam); // position of cursor
If an application processes this message, it should return zero.
An application can use the MAKEPOINTS macro to convert the lParam parameter to a POINTS structure.
If it is appropriate to do so, the system sends the WM_SYSCOMMAND message to the window.
DefWindowProc, MAKEPOINTS, POINTS, WM_NCHITTEST, WM_NCMBUTTONDBLCLK, WM_NCMBUTTONDOWN, WM_SYSCOMMAND
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